Single-Layer Touch Sensor Layout for Lower-Cost Display Panels
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Solution Overview
Problem
The high cost of manufacturing touch sensor panels with drive and sense lines on both sides of a substrate is due to the need for protective measures and flex circuit fabrication on both sides, making them expensive to produce.
Innovation Solution
The solution involves fabricating drive and sense lines on a co-planar single layer on one side of the substrate, with column-like patterns and patches connected by metal traces in the border area, allowing a small flex circuit to be bonded to one side, reducing manufacturing complexity and cost.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If drive and sense lines are formed on both sides of the substrate, then touch sensing capability is improved, but manufacturing cost and complexity increase
Solution Approach 1:
The patent transitions from a traditional dual-sided architecture to a single-sided architecture by arranging drive and sense lines in a co-planar configuration on one side of the substrate. This dimensional reorganization eliminates the need for backside processing while maintaining the mutual capacitance sensing function through in-plane electrode arrangements.
Solution Approach 2:
The patent merges the drive and sense line layers into a single co-planar layer on one side of the substrate. By combining functions that were previously separated across two sides into a unified single-sided structure, the patent eliminates the need for separate backside processing steps and reduces overall manufacturing complexity.
2Reliability
If thin-film processing is performed on both sides of the glass substrate, then complete touch sensor functionality is achieved, but protective measures and processing time increase
Solution Approach 1:
The patent extracts the touch sensing functionality from requiring processing on both sides of the substrate and consolidates it into a single-sided configuration. By removing the necessity for backside thin-film processing, the patent reduces processing time and eliminates the need for protective measures during multi-sided manufacturing operations.
3Reliability
If flex circuit fabrication and bonding are performed on both sides of the substrate, then electrical connections are established, but cost and manufacturing complexity increase
Solution Approach 1:
The patent merges all electrical connection requirements into a single-sided configuration, allowing flex circuit fabrication and bonding to be performed on only one side of the substrate. This consolidation reduces manufacturing complexity by eliminating the need for separate flex circuit operations on both sides while maintaining complete electrical connectivity for the touch sensor array.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach results in a cost-effective, transparent touch sensor panel capable of detecting single or multi-touch events with improved manufacturability and reduced production costs, while maintaining touch sensitivity and accuracy.
Implementation Method 1
a mutual-capacitance multi-touch sensor panel capable of being fabricated on a single side of a substrate
Data Source
AI summary
A touch sensor panel having co-planar single-layer touch sensors fabricated on a single side of a substrate is disclosed. The drive and sense lines can be fabricated as column-like patterns in a first orientation and patches in a second orientation, where each column-like pattern in the first orientation is connected to a separate metal trace in the border area of the touch sensor panel, and all patches in each of multiple rows in the second orientation are connected together using a separate metal trace in the border area of the touch sensor panel. The metal traces in the border areas can be formed on the same side of the substrate as the patches and columns, but separated from the patches and column-like patterns by a dielectric layer.